Who is the most responsible for uniting the German states into a single country? Was it King William the first of Prussia? Auto van Bismarck? Napoleon Bonaparte? Or count camillo Cavor? Which one is correct?

Otto von Bismarck is the most responsible for uniting the German states into a single country. He was instrumental in overseeing the series of wars and negotiations that led to the creation of the German Empire in 1871. King William I of Prussia also played a significant role in the unification process, but Bismarck's leadership and diplomatic skills were crucial in achieving this goal. Napoleon Bonaparte and Count Camillo Cavour, on the other hand, were notable figures in the unification of Italy, not Germany.